The d3.hcl() function in D3.js is used to construct a new HCL color and returns HCL properties of the specified color taken as the parameter of the function.
Syntax:
d3.hcl(color);
Parameters: This function accepts single parameter color which is used to specify the CSS color.
Return Value: This function returns HCL properties of the specified CSS color taken as the parameter of the function.
Below programs illustrate the d3.hcl() function in D3.js:
Example 1:
<!DOCTYPE html> <html>   <head>     <title>d3.hcl() function</title>   </head>   <body>     <script>                   // Calling the d3.hcl() function         // with some parameters         var color1 = d3.hcl("red");         var color2 = d3.hcl("green");         var color3 = d3.hcl("blue");                 // Getting the HCL properties         console.log(color1);         console.log(color2);         console.log(color3);     </script> </body>   </html> |
Output:
{"h":39.99901061253295,"c":104.55176567686985,"l":53.24079414130722,"opacity":1}
{"h":136.01595303206318,"c":71.8500499715016,"l":46.22743146876261,"opacity":1}
{"h":306.2849380699878,"c":133.80761485376166,"l":32.297010932850725,"opacity":1}
Example 2:
<!DOCTYPE html> <html>   <head>     <title>d3.hcl() function</title>   </head>   <body>     <script>                   // Calling the d3.hcl() function         // without any parameters         var color = d3.hcl();                 // Getting the HCL values         console.log(color);     </script> </body>   </html> |
Output:
{"h":null,"c":null,"l":null,"opacity":1}
Reference: https://devdocs.io/d3~5/d3-color#hcl
